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Environmental impact study. Some power plants are located
Chapter 8, Problem 114SE(choose chapter or problem)
Environmental impact study. Some power plants are located near rivers or oceans so that the available water can be used for cooling the condensers. Suppose that, as part of an environmental impact study, a power company wants to estimate the difference in mean water temperature between the discharge of its plant and the offshore waters. How many sample measurements must be taken at each site to estimate the true difference between means to within .2°C with 95% confidence? Assume that the range in readings will be about 4°C at each site and the same number of readings will be taken at each site.
Questions & Answers
QUESTION:
Environmental impact study. Some power plants are located near rivers or oceans so that the available water can be used for cooling the condensers. Suppose that, as part of an environmental impact study, a power company wants to estimate the difference in mean water temperature between the discharge of its plant and the offshore waters. How many sample measurements must be taken at each site to estimate the true difference between means to within .2°C with 95% confidence? Assume that the range in readings will be about 4°C at each site and the same number of readings will be taken at each site.
ANSWER:Step 1 of 2
We need to estimate the number of sample measurements that should be taken at each stage.
The study has been conducted to estimate the true di?erence between the means of
discharge of plants and waters.
We are given the following information:
The estimate of the true difference between means should be within the 0.2
So the margin error of difference of means is ME = 0.2
The confidence level is 95%.
The range of the readings will be 4
The two samples are of equal sizes so
